Nanocalorimetric analysis of the ferromagnetic transition in ultrathin films of nickel
Lopeandía Fernández, Aitor (Universitat Autònoma de Barcelona. Departament de Física)
Pi, F. (Pi i Vila, Francesc) (Universitat Autònoma de Barcelona. Departament de Física)
Rodríguez-Viejo, Javier (Universitat Autònoma de Barcelona. Departament de Física)
American Physical Society

Date:	2008
Abstract:	We report on in situheat capacity measurements (370-800K) using quasiadiabatic ultrafast differential scanning nanocalorimetry in thin films(1-200nm) of Nigrown by electron beam evaporation. The heat capacity shows a broad peak with a rounded maximum that is attributed to the decrease of long-range interactions in the ferromagnetic to paramagnetic phase transition of Ni. The calorimetric data exhibit a reduction of the Curie temperature as the thickness of the films (or the average grain size) decreases. The magnitude of the jump in specific heat at TC scales with the number of surface or interface atoms.
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Heat capacity ; Curie point ; Nickel ; Magnetic films ; Phase transitions ; Nanoparticles ; Surface phase transitions ; Thin film growth ; Atom surface interactions ; Thin films
Published in:	Applied physics letters, Vol. 92, Issue 12 (March 2008) , p. 122503, ISSN 1077-3118

DOI: 10.1063/1.2901166

4 p, 445.8 KB

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